|Message: Re: low energy limit for electron to accelerate in electric field||Not Logged In (login)|
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On Sun, 24 Dec 2017 12:43:18 GMT, elnaz yazd wrote:
> Is There any option to accelerate very low energy (3 eV) electrons in > vacuum by using field in Geant4?
This should work. I have accelerated charged particles from energies below 1 eV in a uniform field, and they end up with the appropriate final energy at the volume boundary (provided I turn off all interaction processes).
> I have defined an electric field according the example field02 and used > the G4EmPenelopePhysics() physics list package to simulate the electrons > interaction . Firstly I should accelerate a 3 eV electron to an energy > above 1keV. For this step when the energy of electron is below 100 eV, > There is no acceleration in the output of this section and by increasing > the electron energy to above this limit, the field accelerate electrons > correctly.
What do you mean by "There is no acceleration"? Do you mean that you don't see the electron's kinetic energy increasing? Or is the track getting killed? G4 does have processes which deposit a very slow particle's energy and then kill it, to avoid wasting CPU time on unnecesasry steps.
If you turn on tracking verbosity (e.g., /tracking/verbose 2) what do you see? Does a 3 eV electron take the steps and reach the kinetic energies you expect? Does it get killed?
-- Michael Kelsey
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